The above gun isn’t exactly what I’d call lethal. But you’ve got to give YouTuber North Bank credit for his (?) ballistic handiwork. I’m a big fan of home-built guns, especially potato guns (which can be lethal). Especially for [supervised] young ‘uns. Manufacturing a home-brew gun is an excellent way to go-hands-on with science. They also prove the point that you can’t stop the signal. Given the simplicity of firearms construction — updated with 3D printing — gun control legislation can’t stop bad people keeping and bearing arms any more than the War on Drugs can stop drug dealers dealing drugs. When you hold a home-build gun of any stripe, you know that’s right.

We used to build guns like this when we were kids. Used a 8 inch long 1/2 pipe nipple and cap as barrel slotted to accept fuse, cloth patched 45 cal balls would penetrate both sides of a galvanized trash can. It is advised to add a 3 inch long 3/4 inch nipple to the chamber end of “gun”, some minor filing will allow this to fit over the 1/2 inch, then slot and align with existing slot cap with 3/4 cap. this greatly reduces any chance of catastrophic failures. Live large, remain safe. This was in the sixties, no we did not wear safety glasses nor hearing protection and we are still all here.